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STM32F4-Discovery lcd 4*20

Discussion in 'ARM' started by dariush_abbasi, May 19, 2012.

  1. dariush_abbasi

    dariush_abbasi New Member

    Joined:
    May 19, 2012
    Messages:
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    Hi everybody,
    I want to interface a 4*20 character lcd to this board,is anyone has the LCD_4bit.c?
    I have that file for stm32f103 but i can't change it for stm32f407.
    Code (text):

    /*----------------------------------------------------------------------------
     * Name:    LCD_4bit.c
     * Purpose: Functions for 2 line 16 character Text LCD (4-bit interface)
     *                connected on MCBSTM32 evaluation board
     * Version: V1.10
     *----------------------------------------------------------------------------
     * This file is part of the uVision/ARM development tools.
     * This software may only be used under the terms of a valid, current,
     * end user licence from KEIL for a compatible version of KEIL software
     * development tools. Nothing else gives you the right to use this software.
     *
     * Copyright (c) 2005-2007 Keil Software. All rights reserved.
     *---------------------------------------------------------------------------*/

    #include "stm32f4_discovery.h"          /* STM32F10x Library Definitions      */

    /*********************** Hardware specific configuration **********************/

    /*------------------------- Speed dependant settings -------------------------*/

    /* If processor works on high frequency delay has to be increased, it can be
       increased by factor 2^N by this constant                                   */
    #define DELAY_2N     0

    /*------------------------- Text LCD size definitions ------------------------*/

    #define LineLen     16                  /* Width (in characters)              */
    #define NumLines     2                  /* Hight (in lines)                   */

    /*-------------------- LCD interface hardware definitions --------------------*/

    /* PINS:
       - DB4 = PC3
       - DB5 = PC2
       - DB6 = PC1
       - DB7 = PC0
       - E   = PC10
       - RW  = PC11
       - RS  = PC12                                                               */

    #define PIN_E                 (   1 << 10)
    #define PIN_RW                (   1 << 11)
    #define PIN_RS                (   1 << 12)
    #define PINS_CTRL             (0x07 << 10)
    #define PINS_DATA             (0x0F <<  0)
    #define PINS_ALL              (PINS_CTRL | PINS_DATA)

    const unsigned int SWAP_DATA[16] = { 0x0, 0x8, 0x4, 0xC, 0x2, 0xA, 0x6, 0xE,
                                         0x1, 0x9, 0x5, 0xD, 0x3, 0xB, 0x7, 0xF};

    /* Enable Clock for peripheral driving LCD pins                               */
    #define LCD_CLOCK_EN         (RCC->APB2ENR |= (1 << 4)); // enable clock for GPIOC

    /* pin E  setting to 0 or 1                                                   */
    #define LCD_E(x)              GPIOC->ODR = (GPIOC->ODR & ~PIN_E)  | (x ? PIN_E : 0);

    /* pin RW setting to 0 or 1                                                   */
    #define LCD_RW(x)             GPIOC->ODR = (GPIOC->ODR & ~PIN_RW) | (x ? PIN_RW : 0);

    /* pin RS setting to 0 or 1                                                   */
    #define LCD_RS(x)             GPIOC->ODR = (GPIOC->ODR & ~PIN_RS) | (x ? PIN_RS : 0);

    /* Reading DATA pins                                                          */
    #define LCD_DATA_IN           SWAP_DATA[(((GPIOC->IDR & PINS_DATA) >> 0) & 0x0F)]

    /* Writing value to DATA pins                                                 */
    #define LCD_DATA_OUT(x)       GPIOC->ODR = (GPIOC->ODR & ~PINS_DATA) | ((SWAP_DATA[x]) << 0);

    /* Setting all pins to output mode                                            */
    #define LCD_ALL_DIR_OUT       GPIOC->CRL = (GPIOC->CRL & 0xFFFF0000) | 0x00003333; \
                                  GPIOC->CRH = (GPIOC->CRH & 0xFFF000FF) | 0x00033300;
                                  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
     
    /* Setting DATA pins to input mode                                            */
    #define LCD_DATA_DIR_IN       GPIOC->CRL = (GPIOC->CRL & 0xFFFF0000) | 0x00004444;

    /* Setting DATA pins to output mode                                           */
    #define LCD_DATA_DIR_OUT      GPIOC->CRL = (GPIOC->CRL & 0xFFFF0000) | 0x00003333;

    /******************************************************************************/


    /* 8 user defined characters to be loaded into CGRAM (used for bargraph)      */
    const char UserFont[8][8] = {
      { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },
      { 0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10 },
      { 0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18 },
      { 0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C },
      { 0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E },
      { 0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F },
      { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },
      { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }
    };


    /************************ Global function definitions *************************/


    /*******************************************************************************
    * Delay in while loop cycles                                                   *
    *   Parameter:    cnt:    number of while cycles to delay                      *
    *   Return:                                                                    *
    *******************************************************************************/

    static void delay (int cnt)
    {
      cnt <<= DELAY_2N;

      while (cnt--);
    }


    /*******************************************************************************
    * Read status of LCD controller                                                *
    *   Parameter:    none                                                         *
    *   Return:       Status byte contains busy flag and address pointer           *
    *******************************************************************************/

    static unsigned char lcd_read_status (void)
    {
      unsigned char status;

      LCD_DATA_DIR_IN
      LCD_RS(0)
      LCD_RW(1)
      delay(10);
      LCD_E(1)
      delay(10);
      status  = LCD_DATA_IN << 4;
      LCD_E(0)
      delay(10);
      LCD_E(1)
      delay(10);
      status |= LCD_DATA_IN;
      LCD_E(0)
      LCD_DATA_DIR_OUT
      return (status);
    }


    /*******************************************************************************
    * Wait until LCD controller busy flag is 0                                     *
    *   Parameter:                                                                 *
    *   Return:       Status byte of LCD controller (busy + address)               *
    *******************************************************************************/

    static unsigned char wait_while_busy (void)
    {
      unsigned char status;

      do  {
        status = lcd_read_status();
      }  while (status & 0x80);             /* Wait for busy flag                 */

      return (status);
    }


    /*******************************************************************************
    * Write 4-bits to LCD controller                                               *
    *   Parameter:    c:      command to be written                                *
    *   Return:                                                                    *
    *******************************************************************************/

    void lcd_write_4bit (unsigned char c)
    {
      LCD_RW(0)
      LCD_E(1)
      LCD_DATA_OUT(c&0x0F)
      delay(10);
      LCD_E(0)
      delay(10);
    }


    /*******************************************************************************
    * Write command to LCD controller                                              *
    *   Parameter:    c:      command to be written                                *
    *   Return:                                                                    *
    *******************************************************************************/

    void lcd_write_cmd (unsigned char c)
    {
      wait_while_busy();

      LCD_RS(0)
      lcd_write_4bit (c>>4);
      lcd_write_4bit (c);
    }


    /*******************************************************************************
    * Write data to LCD controller                                                 *
    *   Parameter:    c:      data to be written                                   *
    *   Return:                                                                    *
    *******************************************************************************/

    static void lcd_write_data (unsigned char c)
    {
      wait_while_busy();

      LCD_RS(1)
      lcd_write_4bit (c>>4);
      lcd_write_4bit (c);
    }


    /*******************************************************************************
    * Print Character to current cursor position                                   *
    *   Parameter:    c:      character to be printed                              *
    *   Return:                                                                    *
    *******************************************************************************/

    void lcd_putchar (char c)
    {
      lcd_write_data (c);
    }


    /*******************************************************************************
    * Initialize the LCD controller                                                *
    *   Parameter:                                                                 *
    *   Return:                                                                    *
    *******************************************************************************/

    void lcd_init (void)
    {
      int i;
      char const *p;

      LCD_CLOCK_EN                          /* Enable clock for peripheral        */

      /* Set all pins for LCD as outputs                                          */
      LCD_ALL_DIR_OUT

      delay (15000);
      LCD_RS(0)
      lcd_write_4bit (0x3);                 /* Select 4-bit interface             */
      delay (4100);
      lcd_write_4bit (0x3);
      delay (100);
      lcd_write_4bit (0x3);
      lcd_write_4bit (0x2);

      lcd_write_cmd (0x28);                 /* 2 lines, 5x8 character matrix      */
      lcd_write_cmd (0x0C);                 /* Display ctrl:Disp=ON,Curs/Blnk=OFF */
      lcd_write_cmd (0x06);                 /* Entry mode: Move right, no shift   */

      /* Load user-specific characters into CGRAM                                 */
      lcd_write_cmd(0x40);                  /* Set CGRAM address counter to 0     */
      p = &UserFont[0][0];
      for (i = 0; i < sizeof(UserFont); i++, p++)
        lcd_putchar (*p);

      lcd_write_cmd(0x80);                  /* Set DDRAM address counter to 0     */
    }



    /*******************************************************************************
    * Set cursor position on LCD display                                           *
    *   Parameter:    column: column position                                      *
    *                 line:   line position                                        *
    *   Return:                                                                    *
    *******************************************************************************/

    void set_cursor (int column, int line)
    {
      unsigned char address;

      address = (line * 40) + column;
      address = 0x80 + (address & 0x7F);
      lcd_write_cmd(address);               /* Set DDRAM address counter to 0     */
    }

    /*******************************************************************************
    * Clear the LCD display                                                        *
    *   Parameter:                                                                 *
    *   Return:                                                                    *
    *******************************************************************************/

    void lcd_clear (void)
    {
      lcd_write_cmd(0x01);                  /* Display clear                      */
      set_cursor (0, 0);
    }


    /*******************************************************************************
    * Print sting to LCD display                                                   *
    *   Parameter:    string: pointer to output string                             *
    *   Return:                                                                    *
    *******************************************************************************/

    void lcd_print (char *string)
    {
      while (*string)  {
        lcd_putchar (*string++);
      }
    }


    /*******************************************************************************
    * Print a bargraph to LCD display                                              *
    *   Parameter:     val:  value 0..100 %                                        *
    *                  size: size of bargraph 1..16                                *
    *   Return:                                                                    *
    *******************************************************************************/
    void lcd_bargraph (int value, int size) {
       int i;

       value = value * size / 20;            /* Display matrix 5 x 8 pixels       */
       for (i = 0; i < size; i++) {
          if (value > 5) {
             lcd_putchar (0x05);
             value -= 5;
          }
          else {
             lcd_putchar (value);
             break;
          }
       }
    }


    /*******************************************************************************
    * Display bargraph on LCD display                                              *
    *   Parameter:     pos_x: horizontal position of bargraph start                *
    *                  pos_y: vertical position of bargraph                        *
    *                  value: size of bargraph active field (in pixels)            *
    *   Return:                                                                    *
    *******************************************************************************/

    void lcd_bargraphXY (int pos_x, int pos_y, int value) {
      int i;

      set_cursor (pos_x, pos_y);
      for (i = 0; i < 16; i++)  {
        if (value > 5) {
          lcd_putchar (0x05);
          value -= 5;
        } else {
          lcd_putchar (value);
          while (i++ < 16) lcd_putchar (0);
        }
      }
    }

    /******************************************************************************/

     

    At least these lines must be changed,what should i do?

    Code (text):


    /* Setting all pins to output mode                                            */
    #define LCD_ALL_DIR_OUT       GPIOC->CRL = (GPIOC->CRL & 0xFFFF0000) | 0x00003333; \
                                  GPIOC->CRH = (GPIOC->CRH & 0xFFF000FF) | 0x00033300;
                                  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
     
    /* Setting DATA pins to input mode                                            */
    #define LCD_DATA_DIR_IN       GPIOC->CRL = (GPIOC->CRL & 0xFFFF0000) | 0x00004444;

    /* Setting DATA pins to output mode                                           */
    #define LCD_DATA_DIR_OUT      GPIOC->CRL = (GPIOC->CRL & 0xFFFF0000) | 0x00003333;
     
    Thanks a lot in advance.
     
  2. AtomSoft

    AtomSoft Well-Known Member

    Joined:
    Feb 7, 2008
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